PR #90865 - sql: use bare string to compare with pk name

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#90865
Commit: cockroachdb/cockroach@746f8f9

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Release note (sql change): previously, the DROP CONSTRAINT, ADD CONSTRAINT
in one trick to have a new primary key without moving old
primary key to be a secondary index didn't work if the primary
key name is a reserved SQL keyword. A constraint already exists
error was returned. This patch fixed the bug, the trick now
also works with primary key named as reserved keywords.

Jira Issue: DOC-6085